The Happy Birthday theme for APUS is a free personalization app developed by APUS Personalization. This app is a gift from APUS Group to celebrate their first anniversary. The app is only compatible with APUS Launcher, so you need to install it first to use this theme.

APUS Launcher is a lightweight and intelligent Android Launcher that delivers an intuitive user experience to 200 million users worldwide. It anticipates your needs and surpasses your expectations. The Happy Birthday theme for APUS is designed to give your phone a festive and celebratory look. The theme includes a colorful wallpaper and custom icons that add a touch of fun to your device.

Overall, the Happy Birthday theme for APUS is a great way to celebrate APUS Group's first anniversary. It is easy to install and use, and it adds a fun and festive touch to your device. However, it is currently limited to APUS Launcher users only.